Brake disc



FIG. 1 is a perspective view of a brake disc showing my design.

FIG. 2 is a front view thereof.

FIG. 3 is a right side view thereof; and,

FIG. 4 is a left side view thereof.

The broken line showing of the side and rear portions of a brake disc depicts environment and forms no part of the claim. 

CLAIM The ornamental design for a brake disc, as shown and described. 